Chapter 14 Flashcards
What is the final common result of ischemia medial damage and marfans that can lead to the formation of an aneurism?
Cystic medial degeneration
Abdominal aortic aneurisms are characterized by severe atherosclerosis of the aorta, and are frequently covered by what?
How can we detect?
- Mural thrombus
- Pulsating mass in the abdomen
Aortic dissections occur when blood enters a defect in the intima and travels though the tissure between the aortic media. Who do aortic dissection most commonly occur in?
- 1. HTN males 40-60 YO
- Pts with CT disorders (Marfan)
What is the main risk factor in a aortic dissection?
HYPERTENSION
How does a patient with an aortic dissection present?
Sudden onset of severe CP that radiates to the back between the scapula and moves downward as the disscection progresses.
What is most commonly confused with a acute MI?
Aortic dissection
Who are AAA more common in?
Men
Smokers
60s
Thoracic aortic aneurism are most often due to what?
- HTN
- Marfans: Defective fibrillin and overactive TGF-B, which weakens elastic tissue
Note that we often see __________ in pts with aortic dissections.
cystic medial degeneration
- Large vessel vasculitis includes aorta and branches (2)
- Temporal (Giant cell) arteritis
- Takayasu arteritis
- Med vessel vasculitis affects muscular arteries, which supply organs
- Polyarteritis nodosa (PAN)
- Kawasaki disease
- Buerger disease
- Small vessel vasculitis affects arterioles, capillaries and venules.
- Wegener granulomatosis
- Microscopic polyangiitis
- Churg-Strauss syndrome
Notice that __________ is the only vasculitis that involves the aorta.
giant cell arteritis
_______ requires eosinophils and is associated with asthma and atopic individuals.
Churg-Strauss
________ requires neutrophils and is associated with orogenital ulcers.
Behçet disease
_________ is associated with young male smokers.
Buerger disease
If we see a patient and ID immune complexes in the vascular wall, what do we do?
Assume DRUG HYPERSENSITIVITY!
Stop the drug => vasculitis should resolve.
Antineutrophil cytoplasmic antibodies (ANCA) are what?
autoAB against enzymes inside of cytoplasm of neutrophils, monoxytes and endothelial cells.
ANCA bind to neutrophils => activate them => cause the release of ROS and cytokines => inflame and damage endothelium => vasculitis
Do vasculitis assx with ANCA have immune complexes?
NO. ANCA produces a pausi-immune response => attack things inside of neutrophils but do not form immune comples. THUS THESE LESIONS WILL NOT HAVE IMMUNE COMPLEX DEPOSITS
PR3-ANCA/c-ANCA) target PR3 and is assx with what vasculitis?
Wegners
Anti-MPO/p-ANCA is asociated with what vasculitis?
1. Microscopic polyangiitis
2. Churg-Strauss
Measuring ANCA can tell us
how serious the disease is.
Immune complex vasculitis is seen in
- Lupus
- Drug hypersensitivity
- Secondary to exposure to infection (Hep B => Polyarteritis nodosa)
_________ are the most common causes of aortitis…
Giant Cell Arteritis and Takayasu
Non-infectious vasculitis occur how?
Immune-mediated
In what vasculitis does fibrinoid necrosis occur?
Small-cell vasculitis
- Most common form of vasculitis in older patients (>50 YO); F
Giant cell arteritis
Giant cell arteritis stems from an immune response by which cells and causes inflammation of arteries where?
- CD4+
- Proximal aorta, carotid artery and branches
Histo in Giant cell arteritis
- CD4+ cells are going to infiltrate the internal elastic lamina and the media.
- MO invate the media and form multinucleated giant cells inside of a granuloma.
- Fragmented ILA and intimal thickening => narrow lumen and ischemia
Inflammation in Giant cell arteritis is what?
Patchy and segmental
Sx in giant cell arteritis
- Temporal artery: HA, facial pain on temporal area
- JAw claudication
- Opthalmic artery: visual disturbacne and double vision
Takayasu arteritis most commonly affects who
Japanese (AZN) females under 40.
Takayasu Arteritis (aka pulseless disease)
Granuloma vasculitis of medium and large arteries characterized by ocular disturbances and marked weak pulses/ low BP in the UE’s
Takayasu arteritis has similar histological findings as those seen in giant cell arteritis (T-cells infiltrate of media and intimal elastic lamina, granulomas and intimal thickening, patchy and focal), except involves which vessels?
Medium and large vessels: Aortic arch and nearby (pulmonary (1/2), carotid and renal); NOT TEMPORAL
Since many features of Takayasu arteritis are shared with Giant Cell arteritis, the distinction between the 2 is primarily made how?
- AGE of the pt
- Takayasu = younger(<50 yo)
- Giant cell = older (>50 yo)
Sx in Takayasi
- Initial sx are non-specific (fatigue, WL, fever, etc)
- Later
-
Vascular symptoms: “pulseless disease” because the lumen of brachiocephalic / carotid / subclavian arteries narrows => decrease BP => weak/absent UE/carotid pulses
- Bruits form d/t turbulent blood flow
- Vascular symptoms then go down to the abdominal aorta and distal aorta
- Pulmonary HTN
- MI
- Renal HTN
- Limb claudication (pain w walking that is relieved w rest
- Ocular disturbances: visual disturbances, retinal hemorrhage, blindness
-
Vascular symptoms: “pulseless disease” because the lumen of brachiocephalic / carotid / subclavian arteries narrows => decrease BP => weak/absent UE/carotid pulses
.
Polyarteritis Nodosa (PAN) is what
fibrinoid necrosis that involves multiple medium sized arteries and involves many organs (SPEC RENAL), but NOT the lungs (pulmonary vessels).
PAN most commonly affects the _____, but not the _____
MC: KIDNEYS
NOT: lungs
In 1/3 of pt’s with polyarteritis nodosa the vasculitis is attributable to chronic infection by which virus?
Immune-complexes composed of what?
HBsAg and anti-HBsAg = Chronic HBV
What process does PAN cause vasculitis
most likely immune complex mediated
List the 4 vessels most often involved in Polyarteritis Nodosa in descending order of frequency.
- - Kidneys
- - Heart
- - Liver
- - GI tract
Histo of PAN
- Polyarteritis nodosa results in a beads on a string appearance that are not circumferential. Because PAN causes acute flares and relapses , it makes lesions at varying stages.
- Early lesions are segmental, transmural (occur across the entire wall= PAN) necrotizing inflammation at BRANCH POINTS (NO GRANULOMAS)
- Often time we can see immune complexes in wall of BV.
- As the wall weakens, they can create an aneurism.
- Lesions that heal => fibrosis, creating the beads on a string.
- Early lesions are segmental, transmural (occur across the entire wall= PAN) necrotizing inflammation at BRANCH POINTS (NO GRANULOMAS)
In PAN are sites of inflammation circumferential
NO
Classic Polyarteritis Nodosa is characterized by what morphological pattern of inflammation?
Segmental TRANMURALnecrotizing inflammation of small- to medium-sized arteries that can heal and fibrose
During acute phase of Polyarteritis Nodosa the transmural inflammation of arterial wall shows a mixed inflammatory infiltrate and is often accompanied by what type of necrosis?
Fibrinoid necrosis
Polyarteritis Nodosa is typically a disease affecting which age group?
Typical course of the disease?
- Young
- Remitting and episodic
Does Polyartertis nodosa form granulomas?
NO
What is a “classic” presentation (signs/sx’s) of Polyarteritis Nodosa?
1. Rapidly accelerating HTN
2. Abdominal pain and bloody stools
3. Myalgias and peripheral neutitis
Tx of PAN
immunosupression; because immune complex mediated